M2.7 earthquake 28 km S of Mammoth, Wyoming

A magnitude 2.7 earthquake struck 28 km S of Mammoth, Wyoming on Thu, Feb 13, 2014, 4:37 PM MST (23:37 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.8 22 km S of Mammoth, Wyoming. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.74	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Final · ±0.511 · 6 stations
2.7	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.5 · 6 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 81 in the 30 days before it.

The first 60 of at least 199.

From the USGS Earthquake Hazards Program and its partner networks, event uu60055677 (also filed as usc000mq7u). Read Fri, Oct 2, 2026, 3:10 PM UTC.